caf9de2f46
That is where we decide if we are going to run gc automatically. Signed-off-by: Junio C Hamano <gitster@pobox.com>
175 lines
3.9 KiB
C
175 lines
3.9 KiB
C
/*
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* git gc builtin command
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*
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* Cleanup unreachable files and optimize the repository.
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*
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* Copyright (c) 2007 James Bowes
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*
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* Based on git-gc.sh, which is
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*
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* Copyright (c) 2006 Shawn O. Pearce
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*/
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#include "builtin.h"
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#include "cache.h"
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#include "run-command.h"
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#define FAILED_RUN "failed to run %s"
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static const char builtin_gc_usage[] = "git-gc [--prune] [--aggressive]";
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static int pack_refs = 1;
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static int aggressive_window = -1;
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static int gc_auto_threshold = 6700;
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#define MAX_ADD 10
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static const char *argv_pack_refs[] = {"pack-refs", "--all", "--prune", NULL};
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static const char *argv_reflog[] = {"reflog", "expire", "--all", NULL};
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static const char *argv_repack[MAX_ADD] = {"repack", "-a", "-d", "-l", NULL};
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static const char *argv_prune[] = {"prune", NULL};
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static const char *argv_rerere[] = {"rerere", "gc", NULL};
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static const char *argv_repack_auto[] = {"repack", "-d", "-l", NULL};
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static int gc_config(const char *var, const char *value)
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{
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if (!strcmp(var, "gc.packrefs")) {
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if (!strcmp(value, "notbare"))
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pack_refs = -1;
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else
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pack_refs = git_config_bool(var, value);
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return 0;
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}
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if (!strcmp(var, "gc.aggressivewindow")) {
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aggressive_window = git_config_int(var, value);
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return 0;
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}
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if (!strcmp(var, "gc.auto")) {
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gc_auto_threshold = git_config_int(var, value);
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return 0;
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}
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return git_default_config(var, value);
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}
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static void append_option(const char **cmd, const char *opt, int max_length)
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{
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int i;
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for (i = 0; cmd[i]; i++)
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;
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if (i + 2 >= max_length)
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die("Too many options specified");
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cmd[i++] = opt;
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cmd[i] = NULL;
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}
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static int need_to_gc(void)
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{
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/*
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* Quickly check if a "gc" is needed, by estimating how
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* many loose objects there are. Because SHA-1 is evenly
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* distributed, we can check only one and get a reasonable
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* estimate.
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*/
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char path[PATH_MAX];
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const char *objdir = get_object_directory();
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DIR *dir;
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struct dirent *ent;
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int auto_threshold;
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int num_loose = 0;
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int needed = 0;
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/*
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* Setting gc.auto to 0 or negative can disable the
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* automatic gc
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*/
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if (gc_auto_threshold <= 0)
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return 0;
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if (sizeof(path) <= snprintf(path, sizeof(path), "%s/17", objdir)) {
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warning("insanely long object directory %.*s", 50, objdir);
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return 0;
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}
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dir = opendir(path);
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if (!dir)
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return 0;
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auto_threshold = (gc_auto_threshold + 255) / 256;
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while ((ent = readdir(dir)) != NULL) {
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if (strspn(ent->d_name, "0123456789abcdef") != 38 ||
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ent->d_name[38] != '\0')
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continue;
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if (++num_loose > auto_threshold) {
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needed = 1;
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break;
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}
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}
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closedir(dir);
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return needed;
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}
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int cmd_gc(int argc, const char **argv, const char *prefix)
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{
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int i;
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int prune = 0;
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int auto_gc = 0;
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char buf[80];
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git_config(gc_config);
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if (pack_refs < 0)
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pack_refs = !is_bare_repository();
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (!strcmp(arg, "--prune")) {
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prune = 1;
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continue;
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}
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if (!strcmp(arg, "--aggressive")) {
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append_option(argv_repack, "-f", MAX_ADD);
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if (aggressive_window > 0) {
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sprintf(buf, "--window=%d", aggressive_window);
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append_option(argv_repack, buf, MAX_ADD);
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}
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continue;
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}
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if (!strcmp(arg, "--auto")) {
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auto_gc = 1;
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continue;
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}
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break;
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}
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if (i != argc)
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usage(builtin_gc_usage);
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if (auto_gc) {
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/*
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* Auto-gc should be least intrusive as possible.
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*/
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prune = 0;
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for (i = 0; i < ARRAY_SIZE(argv_repack_auto); i++)
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argv_repack[i] = argv_repack_auto[i];
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if (!need_to_gc())
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return 0;
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}
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if (pack_refs && run_command_v_opt(argv_pack_refs, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_pack_refs[0]);
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if (run_command_v_opt(argv_reflog, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_reflog[0]);
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if (run_command_v_opt(argv_repack, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_repack[0]);
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if (prune && run_command_v_opt(argv_prune, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_prune[0]);
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if (run_command_v_opt(argv_rerere, RUN_GIT_CMD))
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return error(FAILED_RUN, argv_rerere[0]);
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return 0;
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}
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